What information about an astronomical object can be determined by observing its spectrum?
A) its temperature
B) its radial motion
C) its chemical composition
D) whether it has a strong magnetic field
E) All of the above
E
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The explosion of a supernova typically leaves behind
a. a planetary nebula. b. a shell of hot, expanding gas with a white dwarf at the center. c. a shell of hot, expanding gas with a pulsar at the center. d. nothing is ever left behind.
The habitable zone around a star is
a. the region on a planet where conditions are acceptable for life to exist. b. a region around a star where a planet's temperature would permit the existence of liquid water. c. very small for a massive star. d. only found around G and K stars. e. a region on a young planet where amino acids can begin to form DNA molecules.
Specific heat capacity of ice = 2,000 J/kg-°C latent heat of fusion of water = 334,000 J/kg specific heat capacity of water = 4,000 J/kg-°C After the 1 kg block of ice melts, the amount of heat required to raise its temperature to 10°C is __________
Fill in the blank(s) with correct word
As measured from the Earth, a spacecraft is moving at speed 0.80c toward another spacecraft moving at speed 0.60c in the same direction, i.e., the first spacecraft is catching up with the second spacecraft. What is the speed of the first spacecraft as viewed from the second spacecraft?
a. 0.38c b. –0.20c c. –0.38c d. not given